(CNN)Tori Spelling and husband Dean McDermott have some good news to share.
The former "Beverly Hills 90210" star is expecting their fifth child.
"It was a total surprise," Spelling told People. "But we always wanted a big family. I'm really excited."
The new baby will join the couple's other children Liam, 9, Stella, 8, Hattie, 5, and Finn, 4. Dean also has an 18-year-old son, Jack, from his previous marriage.
"Dean was saying, 'We just got Finn out of diapers; I thought we were in the clear!' " Spelling, 43, said. "For the first time this year, they're all in school. So it's like, wow. We're basically starting over."
Spelling, 43, and McDermott, 49, recently celebrated their 10-year wedding anniversary. She said they could not be happier.
"This baby happened at the best time," says Spelling. "Nothing is ever perfect, but I'm so madly in love with my husband and with our kids. The idea of adding to that is such a blessing."